JP2010056846A - Device and method for processing sound signal, and audio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of reducing out-of-synchronization between an image displayed on a display device and sound output from a speaker when the sound source of the speaker is switched between a reproduction device and the display device, in an audio system including a reproduction device, a display device arranged away from the display device, a plurality of speakers used by the reproduction device and the display device in common. <P>SOLUTION: The sound signal processing device includes: an operation information acquisition part for acquiring operation information related to an operation state of the display device; and a sound processing part for detecting the start of the display device based on the operation information, and adjusting a sound signal supplied to the plurality of speakers so that an image displayed on the display device and sound corresponding to the image are integrally supplied to a viewer viewing the image, when the display device is started. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an audio signal processing device, an audio signal processing method, and an audio system.

Technological development for providing a more optimal sound field to listeners in a closed space such as a vehicle space is underway. For example, Patent Document 1 discloses a technique related to an in-vehicle AV device, and the in-vehicle AV device includes a plurality of speakers arranged in an automobile, a plurality of displays arranged in the automobile, and a plurality of displays. And a control circuit for correcting an audio signal supplied to the speaker. In the on-vehicle AV device, the control circuit detects the power on / off of each of the plurality of displays, and the reproduction sound of the plurality of speakers is turned on among the plurality of displays according to the detection result. The correction circuit is controlled so as to be appropriate at the position where the display is used. Thereby, according to the in-vehicle AV device described in Patent Document 1, an appropriate reproduction sound field is provided regardless of the seating position of the passenger.
JP 2005-88664 A International Publication No. 2001/077254 Pamphlet

  Various technologies have been developed as in-vehicle audio systems. Here, FIG. 1 shows a schematic configuration of an example of a conventional in-vehicle audio system. FIG. 2 is a system block diagram of the conventional vehicle audio system shown in FIG. This conventional in-vehicle audio system 1x includes a head unit (H / U) 2x, a front door speaker 3x, a rear quarter speaker 4x, a ceiling speaker 5x, and a rear seat monitor 6x.

  The head unit 2x is a playback device including a CD, a DVD, an MD, a tuner, a TV, a navigation device, and the like, and has a built-in 4ch amplifier. The rear seat monitor 6x provides an image to a listener seated in the rear seat. The front door speaker 3x, the rear quarter speaker 4x, and the ceiling speaker 5x output sound reproduced by the head unit 2x or sound corresponding to an image displayed on the rear seat monitor 6x.

  Here, in the above-described conventional in-vehicle audio system 1x, when the rear seat monitor 6x is used, the sound contribution from the ceiling speaker 5x is less than the sound from the rear quarter speaker 4x due to insufficient sound pressure of the ceiling speaker 5x. May be less than contribution. In this case, although the ceiling speaker 5x is arranged in the vicinity of the rear seat monitor 6x, there is a concern that the sound from the rear quarter speaker 4x is mainly delivered to the viewer sitting in the rear seat. The That is, the viewer in the rear seat is watching the image displayed on the rear seat monitor 6x disposed in front, and there is a concern that the viewer may feel a gap between the image and the sound corresponding to the image to be heard. The

  The above-described in-vehicle audio system is merely an example, and includes a playback device, a display device arranged away from the playback device, and a plurality of speakers used in common with the playback device and the display device. Many audio systems are known. In such an audio system, when the sound source of the speaker is switched between the playback device and the display device, a deviation occurs between the image displayed on the display device and the sound output from the speaker. There is a concern that

  In the present invention, in view of the problems described above, in an audio system including a playback device, a display device that is disposed apart from the playback device, and a plurality of speakers that are used in common with the playback device and the display device, It is an object of the present invention to provide a technique for reducing a shift between an image displayed on a display device and sound output from the speaker when the sound source of the speaker is switched between the playback device and the display device. .

  In the present invention, in order to solve the above-described problems, a playback device that plays back predetermined content data, and a display device that is provided at a predetermined distance from the playback device and displays an image played back by the playback device And an audio system including a plurality of speakers that output audio signals supplied from the playback device including audio signals corresponding to images displayed on the display device as sound, and detecting activation of the display device Thus, the sound processing is performed on the sound signals supplied to the plurality of speakers so that the image displayed on the display device and the sound corresponding to the image are integrated.

  More specifically, the present invention relates to a playback device that plays back predetermined content data, a display device that is provided at a predetermined distance from the playback device and displays images played back by the playback device, and the display An audio signal for performing acoustic processing on the audio signal in an audio system comprising: a plurality of speakers that output audio signals supplied from the playback device including audio signals corresponding to images displayed by the device; An operation information acquisition unit that acquires operation information relating to an operation state of the display device; and activation of the display device is detected based on the operation information, and the display device is activated when the display device is activated. The audio signals supplied to the plurality of speakers are integrated so that an image displayed on the device and audio corresponding to the image are supplied to a viewer who views the image. It comprises an acoustic processing unit for performing acoustic processing, against.

  According to the present invention, when activation of the display device is detected, an image displayed on the display screen and sound corresponding to the image are integrally supplied to a viewer who views the image. Acoustic processing is performed on the audio signal. As a result, it is possible to reduce a deviation between an image displayed on the display device and a sound output from the speaker, which may occur when the sound source of the speaker is switched between the playback device and the display device.

  An audio signal processing device according to the present invention performs acoustic processing on an audio signal in an audio system. The audio system can include a playback device, a display device, and a plurality of speakers. The playback device plays back predetermined content data. Examples of the content data include music data and image data stored on a CD or DVD. The display device displays an image included in content data reproduced by the reproduction device. Therefore, the display device is preferably electrically connected to the playback device. Although the display device according to the present invention is provided at a predetermined distance from the playback device, the display device may be provided separately from the playback device, and the predetermined distance is not particularly limited. . Examples of the predetermined distance include an interval between a navigation device provided in front of the driver's seat and a rear seat monitor. The plurality of speakers output audio signals supplied from the playback device as audio. The number and arrangement of the speakers are not limited.

  The operation information acquisition unit acquires operation information related to the operation state of the display device, for example, information related to activation or stop of the display device. The operation information acquisition unit may acquire operation information from a separately provided sensor or the like, or may be electrically connected to a display device to directly acquire operation information from the display device.

The acoustic processing unit performs acoustic processing on the audio signals supplied to the plurality of speakers. More specifically, when the display device is activated, the sound processing unit integrally supplies an image displayed on the display device and sound corresponding to the image to a viewer who views the image. The acoustic processing is performed as follows. “Integrated supply” means that there is little deviation between the image and sound provided to the viewer. In the audio signal processing device according to the present invention, the playback device and the display device are provided at a predetermined interval. This means that it is assumed that the listener who listens to the music played on the playback device is different from the viewer who views the image displayed on the display device. Therefore, for example, if the output state of the speaker sound when the music is played back by the playback device is the output state when the display device is activated as it is, the output balance of the speaker sound may be poor. Therefore, in addition to the above, the sound processing unit changes the sound output state of the plurality of speakers so that the plurality of speakers output sound corresponding to the image displayed on the display device when the display device is activated. You may make it do.

  The acoustic processing unit may perform acoustic processing for increasing the gain of an audio signal supplied to a nearby speaker in the vicinity of the activated display device among the plurality of speakers. The acoustic processing unit increases a gain of an audio signal supplied to a nearby speaker in the vicinity of the activated display device among the plurality of speakers, and the distance from the activated display device is You may make it perform the acoustic process which makes small the gain of the audio | voice signal supplied to the speaker far from the distance to a near speaker. Thereby, a sense of unity between the image supplied to the viewer who views the image displayed on the display device and the sound corresponding to the image is obtained.

  Here, in the audio signal processing device according to the present invention, the audio system may be an audio system mounted on a vehicle. In this case, the playback device may be disposed in front of the driver's seat of the vehicle, and the display device may be disposed at a position behind the driver's seat of the vehicle and viewable from the rear seat of the vehicle. it can. Further, the plurality of speakers are a driver seat vicinity speaker provided in the vicinity of the driver's seat, a ceiling speaker disposed in the vicinity of the display device, a rear seat vicinity speaker provided in the vicinity of the rear seat, It can be set as the structure containing.

  Examples of the audio system to which the audio signal processing device according to the present invention can be applied include vehicles and homes. The above-mentioned invention shows one mode when it is applied to a vehicle among these. According to the present invention, an image displayed on a display device and a sound corresponding to the image displayed on the display device and output from a ceiling speaker arranged in the vicinity of the display device. Deviation can be reduced. That is, when activation of the display device is detected in the vehicle, an image displayed on the display device and sound corresponding to the image are supplied integrally to a viewer who views the image.

  Moreover, the process by the acoustic processing unit when the audio signal processing apparatus according to the present invention is applied to an audio system mounted on a vehicle can be performed, for example, as follows. That is, when the display device is activated, the acoustic processing unit outputs sound corresponding to an image displayed by the display device so that the ceiling speaker and the rear seat vicinity speaker output sounds. The ceiling speaker and the rear seat are changed so that an audio output state is changed, and an image displayed on the display device and an audio corresponding to the image are integrated with a viewer who views the image. An audio signal supplied to a nearby speaker is divided into two audio signals, and one of the divided audio signals is divided into one audio signal supplied to the ceiling speaker. The other audio signal that is divided into the middle band or the high band and is increased in gain and divided to be supplied to the rear seat vicinity speaker. In contrast, audio signals of said other is to reduce the gain as well as filtered to a low-frequency band. Thereby, in the vehicle, the image displayed on the display device and the sound corresponding to the image can be integrally supplied to the viewer who views the image.

  The present invention may be a program for realizing any of the functions described above or a recording medium on which the program is recorded. For example, the present invention provides a playback device that plays back predetermined content data, a display device that is provided at a predetermined distance from the playback device and displays images played back by the playback device, and the display device displays An audio signal processing method for performing acoustic processing on the audio signal in an audio system comprising: a plurality of speakers that output audio signals supplied from the playback device including audio signals corresponding to images to be played as audio; An operation information acquisition step for acquiring operation information relating to an operation state of the display device, and detection of activation of the display device based on the operation information, and display on the display device when the display device is activated The audio signals supplied to the plurality of speakers so that the image to be played and the audio corresponding to the image are integrally supplied to a viewer who views the image. An audio signal processing method and audio processing step of performing sound processing, the computer to perform on.

  Moreover, the present invention can be an audio system or a car navigation system incorporating the above-described audio signal processing device. For example, the present invention provides a playback device that plays back predetermined content data, a display device that is provided at a predetermined distance from the playback device and displays an image played back by the playback device, and the display device displays A plurality of speakers for outputting sound signals supplied from the playback device including sound signals corresponding to images to be played as sound, an operation information acquiring unit for acquiring operation information relating to an operation state of the display device, and the operation When activation of the display device is detected based on the information and the display device is activated, an image displayed on the display device and sound corresponding to the image are transmitted to a viewer who views the image. An audio system comprising: an acoustic processing unit that performs acoustic processing on audio signals supplied to the plurality of speakers so as to be integrally supplied.

  According to the present invention, in an audio system that includes a playback device, a display device that is arranged away from the playback device, and a plurality of speakers that are used in common with the playback device and the display device, the sound source of the speaker is When switching between the playback device and the display device, it is possible to reduce the deviation between the image displayed on the display device and the sound output from the speaker.

  Next, an embodiment of an audio signal processing device according to the present invention will be described with reference to the drawings. In the embodiment, a case where the audio signal processing device according to the present invention is incorporated in a 2ch amplifier unit will be described as an example. Thus, existing devices can be used for the head unit, the speaker, the rear seat monitor, and the like. That is, by attaching a 2ch amplifier unit with a built-in audio signal processing device attached later, when the sound source of the speaker is switched between the head unit and the rear seat monitor, it is displayed on the rear seat monitor. The shift between the image and the sound output from the speaker can be reduced. Details will be described below.

<Configuration>
FIG. 3 shows a schematic configuration of the audio system 1 including the audio signal processing device 70 according to the embodiment. FIG. 4 is a block diagram of the audio system 1 including the audio signal processing device 70 according to the embodiment. A passenger including a driver can stay in the vehicle 100 according to the embodiment. The system block diagram of the vehicle-mounted audio system 1 containing the audio | voice signal processing apparatus 70 which concerns on embodiment is shown. A vehicle audio system 1 is mounted on the vehicle 100. The vehicle audio system 1 includes a head unit (H / U) 2, a front door speaker 30, a rear quarter speaker 40, and a ceiling speaker 50. The rear seat monitor 60 and the audio signal processing device 70 are configured.

(Head unit)
The head unit (H / U) 2 corresponds to the reproducing apparatus of the present invention, and has a central processing unit (hereinafter referred to as CPU) 4 inside. The CPU 4 has a control unit 5 therein, and the control unit 5 accesses various content data stored in a hard disk drive (hereinafter referred to as HDD) 10 and reproduces the content data. And so on. The CPU 4 is also electrically connected to a RAM 8 and a ROM 9 as non-volatile memories, and can access information stored in these memories as necessary.

  The control unit 5 mainly performs control for causing the head unit 2 to function as a device that processes content data in order to provide music to the user. For example, the head unit 2 has a function of reproducing content data within the vehicle 100. The content data reproduction process will be described. The head unit 2 includes an interface (I / F) that can be connected to a CD / DVD deck (hereinafter simply referred to as a CD deck) 11, an HDD 10, and a portable music terminal, for example. 12, processing of content data from the navigation device 13 and the user of the vehicle 100 (a person who can operate the head unit 2 such as a mobile operator or a passenger, and the same shall apply hereinafter). And an operation unit 31 that receives commands related to the system control unit 5, each of which is electrically connected to the system control unit 5. Further, a DSP (Digital Signal Processor) 19 is electrically connected to the control unit 5, and the DSP 19 performs arithmetic processing such as encoding and decoding on the content data sent from the control unit 5, and a 4ch amplifier (AMP) The electric signal for music performance is sent to 20. In addition, although the navigation device 13 is provided in the head unit 4 according to the present embodiment, the navigation device 13 may not be provided.

  The operation unit 31 receives a user operation as a command related to the content data reproduction process. The received instruction from the user is sent to the control unit 5 as an electrical signal. The operation unit 31 is, for example, a volume adjustment button that adjusts the volume output from a plurality of speakers, a map position movement button that draws a position in the direction of east, west, south, and north from the current drawing when the navigation device 13 is mainly activated, A track up / down button for transferring content data to be reproduced, a power switch for switching the power supply of the head unit 2, and the like can be used.

  In addition to the content data information, the display unit 32 can display a map drawing when the navigation device 13 is activated. Further, the attribute information of the content data can be displayed on the display unit 32. The attribute information of the content data includes, for example, song information and artist information of the content data.

(Rear seat monitor)
The rear seat monitor 60 is provided on the ceiling behind the driver's seat of the vehicle 100 and provides an image to a listener seated in a rear seat (also referred to as a rear seat). The rear seat monitor 60 according to the present embodiment can be accommodated on the ceiling by being folded when not in use. The rear seat monitor 60 may display content data (images) from the head unit 2. The rear seat monitor 60 may display content data (images) supplied from a DVD deck or the like dedicated to the rear seat monitor 60 provided separately in the vehicle 100. The rear seat monitor 60 according to the present embodiment includes a display unit 61 that displays content data, an operation unit 62 that receives operations on the rear seat monitor 60, and the like. The operation unit 62 also includes a power switch for turning on / off the rear seat monitor 60.

(Speaker)
The vehicle 100 is provided with a plurality of speakers such as a front door speaker (SP) 30, a rear quarter speaker (SP) 40, and a ceiling speaker (SP) 50. The plurality of speakers output sound reproduced by the head unit 2 or sound corresponding to an image displayed on the rear seat monitor 60.

  A total of two front door speakers 30 (front door speaker (L) and front door speaker (R)) are provided on the left and right front doors, that is, the door for the passenger seat and the door for the passenger seat. A total of two rear quarter speakers 40 (rear quarter speakers (L) and rear quarter speakers (R)) are provided on both side surfaces of the vehicle 100 near the rear seat. Each of the front door speaker 30 and the rear quarter speaker 40 is configured by a so-called full-range speaker that outputs a low range to a high range with a single speaker. In the embodiment, the rear quarter speaker 40 is responsible for the low frequency band. Two ceiling speakers 50 (ceiling speaker (L) and ceiling speaker (R)) are provided in the vicinity of the rear seat monitor 60 on the ceiling of the vehicle 100. The ceiling speaker 50 is disposed at a position closest to the rear seat monitor 60 among the plurality of speakers provided in the vehicle 100. In the present embodiment, the ceiling speaker 50 is responsible for the mid-band to high-band. The front door speaker 30 is electrically connected to a 4ch amplifier 20 provided in the head unit 2 and outputs an audio signal amplified by the 4ch amplifier 20 as sound. On the other hand, the rear quarter speaker 40 and the ceiling speaker 50 are electrically connected to the audio signal processing device 70, and output the audio signal amplified by the 2ch amplifier 21 in the 2ch amplifier unit 700 as sound.

  Here, in the conventional in-vehicle audio system, the sound contribution from the ceiling speaker 50 may be lower than the sound contribution from the rear quarter speaker 40 due to insufficient sound pressure of the ceiling speaker 50, and as a result, In spite of the fact that the ceiling speaker 50 is disposed in the vicinity of the rear seat monitor 60, there is a concern that the viewer seated in the rear seat is mainly delivered the sound from the rear quarter speaker 40. That is, the viewer in the rear seat is watching an image or video (hereinafter simply referred to as an image) displayed on the rear seat monitor 60 disposed in front, and the sound corresponding to the image and the image that enters the auditory sense. There was concern about feeling a gap between the two. In order to solve such a problem, in the present embodiment, in order to reduce the difference between the image displayed on the rear seat monitor 60 and the sound output from the plurality of speakers, Acoustic processing is performed on the audio signals supplied to the rear quarter speaker 40 and the ceiling speaker 50. Hereinafter, the audio signal processing device 70 will be described.

(Audio signal processor)
The audio signal processing device 70 is incorporated in the 2ch amplifier unit 700 and performs acoustic processing on audio signals supplied to the rear quarter speaker 40 and the ceiling speaker 50. In this embodiment, the 2ch amplifier unit 700 is installed below the driver's seat, but the installation position is not particularly limited. Here, FIG. 5 is a block diagram of the audio signal processing device 70 according to the embodiment. As shown in FIG. 5, the audio signal processing device 70 includes an attenuating unit 71, a branching unit 79, an equalizing unit (EQ unit) 72, a high-pass filter unit (HPF unit) 73, a low-pass filter unit (LPF unit) 74, and gain adjustment. The unit 75, the addition unit 76, the output adjustment unit 77, and the amplifier control unit 78 are configured. The attenuating unit 71, the branching unit 79, the high-pass filter unit (HPF unit) 73, the low-pass filter unit 74, and the output adjustment unit 77 are classified into Lch correspondence and Rch correspondence (L added after the code is Lch correspondence). , R represents Rch correspondence.), The equalizing unit (EQ unit) 72, and the gain adjusting unit 75 are distinguished from Lch correspondence and Rch correspondence, and are distinguished corresponding to each route after branching (reference numerals). L added later represents Lch correspondence, R represents Rch correspondence, and the numbers attached after L and R represent the route after branching.) Each of the functional units such as the attenuating unit 71 has the same function even if the corresponding channel or route is different, so that only the symbols are shown unless it is necessary to distinguish them. To do.

The attenuation unit 71 attenuates the audio signal output from the head unit 2 to an appropriate signal level. In the present embodiment, as the attenuation unit 71, among the audio signals output from the head unit 2, the attenuation unit 71 </ b> L to which the audio signals to the ceiling speaker 50 </ b> L and the rear quarter speaker 40 </ b> L are input and the head unit 2 output. Among the audio signals, there is an attenuation unit 71R to which audio signals are input to the ceiling speaker 50R and the rear quarter speaker 40R. The attenuation unit 71 can be configured by an attenuator. The audio signal attenuated by the attenuation unit 71 is output to the branch unit 79.

  The branching unit 79 divides the audio signal attenuated by the attenuation unit 71 into two signals. In the present embodiment, the branching unit 79 includes a branching unit 79L that branches the audio signal from the attenuation unit 71L and a branching unit 79R that branches the audio signal from the attenuation unit 71R. The branch unit 79 can be configured by a branch circuit. The audio signal branched by the branching unit 79 is output to the equalizing unit 72.

  The equalizing unit 72 changes the frequency characteristic of the audio signal branched by the branching unit 79 (also referred to as equalizing). In the present embodiment, as the equalizing unit 72, an equalizing unit 72L1 provided in the first route of Lch, an equalizing unit 72L2 provided in the second route of Lch, an equalizing unit 72R1 provided in the first route of Rch, and Rch And an equalizing section 72R2 provided in the second route. The equalizing unit 72 can be configured by an equalizer circuit. The first route means a signal path where the high pass filter unit 73 is provided, and the second route means a signal path where the low pass filter unit 74 is provided. The audio signal equalized by the equalizing unit is output to the high pass filter unit 73 or the low pass filter unit 74.

  The high-pass filter unit 73 attenuates the audio signal in the low frequency band and passes the audio signal in the high frequency band. On the other hand, the low-pass filter unit 74 attenuates the audio signal in the high frequency band and passes the audio signal in the low frequency band. In the present embodiment, the high-pass filter unit 73 includes a high-pass filter unit 73L provided in the Lch and a high-pass filter unit 73R provided in the Rch. Further, as the low-pass filter unit 74, there are a high-pass filter unit 73L provided in the Lch and a low-pass filter unit 74R provided in the Rch. The high-pass filter unit 73 and the low-pass filter unit 74 can each be configured by a filter circuit. The audio signal that has passed through the high-pass filter unit 73 or the low-pass filter unit 74 is output from each filter to the gain adjustment unit 75.

  The gain adjusting unit 75 adjusts the gain (sound pressure) of the audio signal from the high pass filter unit 73 or the low pass filter unit 74. In this embodiment, as the gain adjusting unit 75, a gain adjusting unit 75L1 provided in the first route of Lch, a gain adjusting unit 75L2 provided in the second route of Lch, and a gain adjusting unit provided in the first route of Rch. 75R1 and a gain adjusting unit 75R2 provided in the second route of Rch. The gain adjusting unit 75 can be configured by a variable circuit. Note that the audio signal processing device 70 according to the present embodiment adjusts the gain according to the activation state of the rear seat monitor 60, and is output from an image displayed on the rear seat monitor 60 and a plurality of speakers. It is characterized by reducing the deviation from the voice. Specific adjustment of the gain will be described later. The audio signal whose gain has been adjusted is output from the gain adjusting unit 75 to the adding unit 76.

  The adder 76 adds the audio signal from the first route and the audio signal from the second route. In the present embodiment, the adding unit 76 includes an adding unit 76L provided in the Lch and an adding unit 76R provided in the Rch. The adding unit 76 can be configured by an adding circuit. The audio signal added by the adding unit 76 is output from the adding unit 76 to the output adjusting unit 77.

The output adjustment unit 76 adjusts the output of the audio signal. In the present embodiment, the output adjustment unit 76 includes an output adjustment unit 76L provided in the Lch and an output adjustment unit 76R provided in the Rch. The output adjustment unit 76 can be configured by an audio power IC. The audio signal whose output is adjusted by the output adjustment unit 76 is output from the output adjustment unit 76 to a plurality of speakers, and is finally output into the vehicle 100 from each speaker as audio.

  The amplifier control unit 78 controls acoustic processing executed by the 2ch amplifier 21. The amplifier control unit 78 includes an operation information acquisition unit 781, an acoustic processing unit 782, and a storage unit 783. The internal configuration of the amplifier control unit 78 can be realized by a program executed by the CPU 780. Instead of such a configuration, the amplifier control unit 78 may realize any one or more of the internal configurations by a processor, hardware circuit, or the like different from the CPU 780.

  The motion information acquisition unit 781 acquires information regarding activation or stop of the rear seat monitor 60 as motion information regarding the state of the operation of the rear seat monitor 60. In the present embodiment, the operation information acquisition unit 781 acquires information related to activation or stop of the rear seat monitor 60 directly from the power switch of the rear seat monitor 60. Note that a sensor may be separately arranged, and the operation information of the rear seat monitor 60 may be acquired from the arranged sensor. In the present embodiment, the rear seat monitor 60 is a foldable type, and therefore a signal from a motor that folds the rear seat monitor 60 may be acquired as operation information of the rear seat monitor 60.

  When the rear seat monitor 60 is activated, the sound processing unit 782 supplies the image displayed on the rear seat monitor 60 and the sound corresponding to the image to the viewer who views the image. To perform acoustic processing. More specifically, when the rear seat monitor 60 is activated, the sound processing unit 782 lowers the low-frequency band gain handled by the rear quarter speaker 40 and the mid-high to high-frequency gain handled by the ceiling speaker 50. The gain adjustment unit 75 is controlled so as to increase the value. Details of the acoustic processing by the acoustic processing unit 782 will be described later. In this embodiment, the acoustic processing unit 782 accesses the gain adjustment table stored in the storage unit 783 and executes acoustic processing.

  The storage unit 783 stores a gain adjustment table used when performing gain adjustment. Here, FIG. 6 shows a gain adjustment table. As shown in the figure, the gain adjustment table is divided for each gain adjustment unit 75, and gain up or down at the time of starting or stopping the rear seat monitor is recorded for each gain adjustment unit 75. For example, when the rear seat monitor 60 is activated, the gains of the gain adjustment unit 75L1 and the gain adjustment unit 75R1 are increased. The storage unit 783 stores a predetermined program executed by the CPU 780 of the amplifier control unit 78. The storage unit 783 includes a volatile RAM (Random Access Memory) and a nonvolatile ROM (Read Only Memory). The ROM includes a rewritable semiconductor memory such as a flash memory, an EPROM (Erasable Programmable Read-Only Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory).

<Processing flow>
Next, acoustic processing performed by the amplifier control unit 78 of the audio signal processing device 70 according to the present embodiment will be described. FIG. 7 shows an acoustic processing flow. As shown in the figure, in step S01, the operation information acquisition unit 781 acquires the operation information of the rear seat monitor 60. When the acquisition of the operation information is completed, the process proceeds to step S02.

In step S02, the acoustic processing unit 782 determines whether the rear seat monitor 60 is activated (ON) or stopped (OFF) based on the acquired operation information. Whether the rear seat monitor 60 is ON or OFF depends on whether or not the voltage (for example, DCXXV) of the electrical signal from the rear seat monitor 60 acquired as the operation information exceeds a predetermined value. Judgment can be made. If the rear seat monitor 60 is activated (ON), the process proceeds to step S03. On the other hand, when the rear seat monitor 60 is stopped, the process proceeds to step S02 again.

  In step S03, the gain is adjusted. Specifically, the gains of the gain adjustment unit 75L1 and the gain adjustment unit 75R1 are increased by the acoustic processing unit 782, and the gains of the gain adjustment unit 75L2 and the gain adjustment unit 75R2 are decreased. As a result, the gain of the mid- to high-band audio signal passing through the high-pass filter unit 73 is increased, and the gain of the low-band audio signal passing through the low-pass filter unit 74 is reduced and added by the adder 76. An audio signal is output to the ceiling speaker 50 or the rear quarter speaker 40. Here, in the present embodiment, the ceiling speaker 50 is in charge of the middle band, and the rear quarter speaker 40 is in charge of the low band. Therefore, the contribution of the sound output from the ceiling speaker 50 located in the vicinity of the rear seat monitor 60 to the rear seat is large, and the rear quarter is farther away from the rear seat monitor 60 than the ceiling speaker 50. The degree of contribution of the sound output from the speaker 40 to the rear seat is reduced. As a result, when the sound sources of the plurality of speakers are switched between the head unit 2 and the rear seat monitor 60, between the image displayed on the rear seat monitor 60 and the sound output from the plurality of speakers. The deviation can be reduced. Note that the processing in step S03 is processing when the rear seat monitor 60 is turned from OFF to ON, and no gain adjustment is particularly performed when the rear seat monitor 60 is turned from ON to ON.

  For example, when the sound output of the plurality of speakers when the head unit 2 is playing music is the output state when the rear seat monitor 60 is activated as it is, the output balance of the sounds of the plurality of speakers is poor. There is. Therefore, when the rear seat monitor 60 is activated, the acoustic processing unit 782 first outputs a plurality of sounds so that the rear quarter speaker 40 and the ceiling speaker 50 output sound corresponding to the image displayed on the rear seat monitor 60. The output state of the sound of the speaker may be changed, and then the gain may be adjusted.

  In step S04, the acoustic processing unit 782 decreases the gains of the gain adjustment unit 75L1 and the gain adjustment unit 75R1, and increases the gains of the gain adjustment unit 75L2 and the gain adjustment unit 75R2. Note that the processing in step S04 is processing when the rear seat monitor 60 is switched from ON to OFF, and no gain adjustment is particularly performed when the rear seat monitor 60 is switched from OFF to OFF.

<Effect>
According to the audio signal processing device according to the embodiment described above, when the rear seat monitor 60 is activated, the sound output from the ceiling speaker 50 located near the rear seat monitor 60 is input to the rear seat. The contribution degree increases, and the contribution degree to the rear seat of the sound output from the rear quarter speaker 40 that is far from the rear seat monitor 60 than the ceiling speaker 50 decreases. As a result, when the sound sources of the plurality of speakers are switched between the head unit 2 and the rear seat monitor 60, between the image displayed on the rear seat monitor 60 and the sound output from the plurality of speakers. The deviation can be reduced.

  In the above-described embodiment, existing devices can be used by installing the audio signal processing device 70 separately from the head unit 2. However, it is not limited to such an aspect. The audio signal processing device 70 may be incorporated in the head unit 2. In addition to the gain adjustment in the above-described embodiment, a delay process or the like may be performed. Thereby, the shift | offset | difference between the image displayed on the monitor 60 for rear seats and the audio | voice output from a some speaker can be reduced more.

The schematic structure of an example of the conventional vehicle-mounted audio system is shown. The system block diagram of the conventional vehicle-mounted audio system shown in FIG. 1 is shown. 1 shows a schematic configuration of an audio system including an audio signal processing device according to an embodiment. 1 is a block diagram of an audio system including an audio signal processing device according to an embodiment. 1 is a block diagram of an audio signal processing device according to an embodiment. FIG. A gain adjustment table is shown. The acoustic processing flow is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Audio system 2 ... Head unit 4 ... CPU
5 ... Control unit 8 ... RAM
9 ... ROM
10 ... HDD
10a ... Music DB
11 ... CD / DVD deck 12 ... I / FUSB
13 ... Navi device 19 ... DSP
20 ... 4ch amplifier 21 ... 2ch amplifier 30 ... front door speaker 40 ... rear quarter speaker 50 ... ceiling speaker 60 ... rear seat monitor 70 ... audio signal processing device 71- ..Attenuating unit 72 ... equalizing unit 73 ... high pass filter unit 74 ... low pass filter unit 75 ... gain adjusting unit 76 ... adding unit 77 ... output adjusting unit 78 ... amplifier control Part 79 ... Branch part 780 ... CPU (2ch amplifier)
781 ... Motion information acquisition unit 782 ... Sound processing unit 783 ... Storage unit (conventional technology)
1x ... audio system, 2x ... head unit, 3x ... front door speaker, 4x ... rear quarter speaker, 5x ... ceiling speaker

Claims (9)

A playback device that plays back predetermined content data, a display device that is provided at a predetermined distance from the playback device and displays an image played back by the playback device, and audio corresponding to the image displayed by the display device An audio signal processing device that performs acoustic processing on the audio signal in an audio system, comprising: a plurality of speakers that output audio signals supplied from the playback device including the audio signal;
An operation information acquisition unit that acquires operation information related to an operation state of the display device;
When activation of the display device is detected based on the operation information and the display device is activated, an image displayed on the display device and sound corresponding to the image are displayed to a viewer who views the image. An acoustic processing unit that performs acoustic processing on audio signals supplied to the plurality of speakers so as to be integrally supplied to the plurality of speakers;
An audio signal processing apparatus comprising:   The sound processing unit integrally supplies an image supplied to a viewer who views the image displayed on the display device and a sound corresponding to the image to the viewer who views the image. As described above, the audio signal processing device according to claim 1, wherein acoustic processing for increasing a gain of an audio signal supplied to a nearby speaker in the vicinity of the activated display device among the plurality of speakers is performed.   The sound processing unit integrally supplies an image supplied to a viewer who views the image displayed on the display device and a sound corresponding to the image to the viewer who views the image. As described above, among the plurality of speakers, the gain of the audio signal supplied to the nearby speaker in the vicinity of the activated display device is increased, and the distance from the activated display device is the distance to the nearby speaker. The audio signal processing device according to claim 1, wherein acoustic processing is performed to reduce a gain of an audio signal supplied to a speaker farther than the distance. The audio system is mounted on a vehicle,
The playback device is disposed in front of the driver's seat of the vehicle,
The display device is arranged behind the driver's seat of the vehicle and at a position where viewing is possible from a rear seat of the vehicle,
The plurality of speakers includes a driver seat vicinity speaker provided in the vicinity of the driver's seat, a ceiling speaker disposed in the vicinity of the display device, and a rear seat vicinity speaker provided in the vicinity of the rear seat. The audio signal processing device according to any one of claims 1 to 3. A playback device that plays back predetermined content data, a display device that is provided at a predetermined distance from the playback device and displays an image played back by the playback device, and audio corresponding to the image displayed by the display device An audio signal processing method for performing acoustic processing on the audio signal in an audio system comprising: a plurality of speakers that output audio signals supplied from the playback device including the audio signal;
An operation information acquisition step of acquiring operation information related to the operation state of the display device;
When activation of the display device is detected based on the operation information and the display device is activated, an image displayed on the display device and sound corresponding to the image are displayed to a viewer who views the image. An acoustic processing step for performing acoustic processing on audio signals supplied to the plurality of speakers so as to be integrally supplied to the plurality of speakers;
A sound signal processing method executed by a computer. In the acoustic processing step, the image supplied to the viewer who views the image displayed on the display device and the sound corresponding to the image are integrally supplied to the viewer who views the image. The audio signal processing method according to claim 5, wherein acoustic processing for increasing a gain of an audio signal supplied to a nearby speaker in the vicinity of the activated display device among the plurality of speakers is performed.   In the acoustic processing step, the image supplied to the viewer who views the image displayed on the display device and the sound corresponding to the image are integrally supplied to the viewer who views the image. As described above, among the plurality of speakers, the gain of the audio signal supplied to the nearby speaker in the vicinity of the activated display device is increased, and the distance from the activated display device is the distance to the nearby speaker. The audio signal processing method according to claim 6, wherein acoustic processing for reducing a gain of an audio signal supplied to a farther speaker is performed. A playback device for playing back predetermined content data;
A display device that is provided at a predetermined distance from the playback device and displays an image played back by the playback device;
A plurality of speakers for outputting audio signals supplied from the playback device including audio signals corresponding to images displayed by the display device as audio;
An operation information acquisition unit that acquires operation information related to an operation state of the display device;
When activation of the display device is detected based on the operation information and the display device is activated, an image displayed on the display device and sound corresponding to the image are displayed to a viewer who views the image. An acoustic processing unit that performs acoustic processing on audio signals supplied to the plurality of speakers so as to be integrally supplied to the plurality of speakers;
An audio system comprising:   The sound processing unit integrally supplies an image supplied to a viewer who views the image displayed on the display device and a sound corresponding to the image to the viewer who views the image. As described above, the audio system according to claim 8, wherein acoustic processing is performed to increase a gain of an audio signal supplied to a nearby speaker in the vicinity of the activated display device among the plurality of speakers.

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